从Python列表创建字典数组

# 创建一个包含多个字典的列表
user_list = [
    {"username": "Alice", "email": "alice@example.com", "age": 25},
    {"username": "Bob", "email": "bob@example.com", "age": 30},
    {"username": "Charlie", "email": "charlie@example.com", "age": 35}
]

# 打印字典数组
print(user_list)

# 访问字典数组中的元素
print(user_list[0]["username"])  # 输出: Alice
print(user_list[1]["email"])     # 输出: bob@example.com

import csv

user_list = []

with open('users.csv', newline='') as csvfile:
    reader = csv.DictReader(csvfile)
    for row in reader:
        user_list.append(row)

print(user_list)

user_list = [
    {"username": "Alice", "email": "alice@example.com", "age": 25},
    {"username": "Bob", "email": "bob@example.com", "age": 30},
    {"username": "Alice", "email": "alice2@example.com", "age": 26}
]

# 合并重复键的值
unique_users = {}
for user in user_list:
    username = user["username"]
    if username not in unique_users:
        unique_users[username] = user
    else:
        if "emails" not in unique_users[username]:
            unique_users[username]["emails"] = [unique_users[username]["email"]]
        unique_users[username]["emails"].append(user["email"])

print(list(unique_users.values()))